Sometimes, you have to go with what works. It's no secret that some mechanics are tried-and-true, and will allow you to please gamers while adding in your own twists. Sometimes, though, it's evident when a game borrows a bit too much and doesn't give enough back.
Happy Vikings mixes gameplay from a number of different classic puzzle titles, including a lifting-and-matching mechanic from an NES game called Wario's Woods. Instead of just flipping tiles with a cursor, you actually have a sprite in the puzzle area which you can use to manipulate tiles.